额定蒸发量大于0.5t/h的小型dgboiler.com/" title="dgboiler">dgboiler.com/" title="dgboiler.com/" title="dgboiler">dgboiler">dgboiler.com/" title="dgboiler">dgboiler.com/" title="dgboiler.com/" title="dgboiler">dgboiler.com/" title="dgboiler.com/" title="dgboiler">dgboiler">dgboiler.com/" title="dgboiler">dgboiler">dgboiler.com/" title="dgboiler">dgboiler.com/" title="dgboiler.com/" title="dgboiler">dgboiler">dgboiler.com/" title="dgboiler">dgboiler.com">蒸汽锅炉，至少装设两个安全阀；额定蒸发量小于或等于0.5t/h的锅炉，至少装一个安全阀。可分式省煤器出口处、蒸汽过热器出口处都必须装设安全阀。 安全阀应垂直安装在锅商、集箱的较高位置。在安全阀和锅筒或集箱之间，不得装有取用蒸汽的出口管和阀门。杠杆式安全阀要有防止重锤自行移动的装置和限制杠杆越轨的导架，弹簧式安全阀要有提升手把和防止随便拧动调整螺钉的装置。对于额定蒸汽压力小于或等于3.82MPa的锅炉，安全阀喉径不应小于25mm；对于额定蒸汽压力大于3.82MPa的锅炉，安全阀喉径不应小于20mm。 安全阀与小型蒸汽锅炉的连接管，其截面积应不小于安全阀的进口截面积。如果几个安全阀共同装设在一根与锅筒直接相连的短管上，短管的通路截面积应不步于所有安全阀排汽面积的1.25倍。 安全阀一般应装设排汽管，排汽管应直通安全地点，并有足够的截面积，保证排汽畅通。安全阀排气管底部应装腔作势有接到安全地点的疏水管，在排气管和疏水管上都不允许装设阀门。

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